GB2290409A - Operation of fuel cell wherein poisoned anode catalyst is intermittently rejuvenated by applying a DC potential - Google Patents

Operation of fuel cell wherein poisoned anode catalyst is intermittently rejuvenated by applying a DC potential Download PDF

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Publication number
GB2290409A
GB2290409A GB9511533A GB9511533A GB2290409A GB 2290409 A GB2290409 A GB 2290409A GB 9511533 A GB9511533 A GB 9511533A GB 9511533 A GB9511533 A GB 9511533A GB 2290409 A GB2290409 A GB 2290409A
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United Kingdom
Prior art keywords
fuel cell
circuit
potential
time period
cell
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Granted
Application number
GB9511533A
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GB9511533D0 (en
GB2290409B (en
Inventor
Christopher David Dudfield
Andrew Leslie Dicks
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British Gas PLC
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British Gas PLC
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Publication of GB2290409A publication Critical patent/GB2290409A/en
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Publication of GB2290409B publication Critical patent/GB2290409B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04955—Shut-off or shut-down of fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M16/00—Structural combinations of different types of electrochemical generators
    • H01M16/003—Structural combinations of different types of electrochemical generators of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers
    • H01M16/006—Structural combinations of different types of electrochemical generators of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers of fuel cells with rechargeable batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04895—Current
    • H01M8/04917—Current of auxiliary devices, e.g. batteries, capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel Cell (AREA)

Description

1 A Method of Operating A Fuel Cell 2290409 This invention concerns a
method of operating a fuel cell, and also concerns apparatus to perform the method when in combination with the fuel cell.
The fuel cell concerned is of the type (hereinafter called the type referred to) comprising an anode and a cathode each comprising catalyst means comprising platinum.
It is known to supply fuel cells of the type referred to with hydrogen gas fuel to the anode and oxygen gas oxidant to the cathode. The hydrogen should not contain substances which will poison the catalyst means. It is known to supply hydrogen produced by reforming a hydrocarbon, for example methane or natural gas. However the resultant hydrogen may also contain carbon monoxide which is preferentially adsorbed onto the surface of the anode catalyst means comprising platinum and poisons the catalyst means at the anode resulting in the effective internal resistance of the cell increasing and the external current decreasing to a low or possibly zero level. Thus as the anode becomes increasingly poisoned, the cell performance deteriorates. To avoid poisoning of the catalyst means, it is known to use catalytic or other means to convert the carbon monoxide in the hydrogen fuel gas to carbon dioxide (or some other substance, for example methane, which 2 does not poison the catalyst means) before the hydrogen is supplied to the cell.
The provision of such catalytic or other means to convert carbon monoxide to carbon dioxide (or said other substance which is non-poisonous to the catalyst means) externally of the fuel cell not only adds an extra process and increases costs, but it does not cure the problem of detoxifying the catalyst means of the anode, should any carbon monoxide be carried into the cell with the hydrogen.
An object of the invention is to provide a method of operating a fuel cell of the type referred to in which the catalyst means of the anode which may be subject to poisoning by carbon monoxide can be detoxified (or the cell rejuvenated) in a relatively simple and inexpensive manner.
According to a first aspect of the invention there is provided a method of operating a fuel cell of the type comprising an anode and a cathode each comprising catalyst means comprising platinum, the method comprising supplying gaseous fuel comprising hydrogen and/or a gaseous alcohol to said anode and supplying gaseous oxidant comprising oxygen to said cathode, operating the fuel cell at a temperature which does not exceed substantially 2500C, providing an interruptable first circuit externally of the cell for electric current derived from the cell to flow in the external circuit from the cathode to the 3 anode by reason of the cathode being at a positive potential relative to the anode, providing a second circuit externally of the cell, said second circuit comprising electrical energy supply means to supply selectively a reverse D.C. potential to said anode and cathode thereby putting the anode at a positive potential with respect to said cathode, interrupting and completing the first circuit alternately and operating the second circuit whereby when the first circuit is interrupted the reverse D.C. potential is applied simultaneously by means of the second circuit and when the first circuit is completed application of said reverse potential ceases, said first circuit being completed for a first time period and said reverse D.C. potential being applied for a second time period, said first time period being at least ten times greater than said second time period, and the second time period being not greater than substantially 0.25 seconds.
According to a second aspect of the invention there is provided apparatus to be used in combination with a fuel cell or with a stack or battery thereof so that when the apparatus is in use in said combination the or each fuel cell is operated according to the method defined according to said first aspect of the invention provided the or each said fuel cell is operated at said temperature condition and is supplied with said gaseous fuel.
4 Using certain know electrolytes in the fuel cell, the operating temperature need not exceed substantially 1001C and possibly need not exceed substantially 800C, an example of such an electrolyte is a solid polymer electrolyte. If the fuel cell is an alkaline fuel cell in which the electrolyte is a liquid alkaline electrolyte, the operating temperatur is substantially 650C. Using certain other known electrolytes, which may be liquid, the operating temperature need not exceed substantially 2500C and possibly need not exceed substantially 2000C, an example of such an electrolyte is a phosphoric acid electrolyte.
Each aspect of the invention will now be further described, by way of example, with reference to the accompanying drawings in which:- Fig. 1 diagramatically shows one embodiment of apparatus in combination with a fuel cell according to the second aspect of the invention for carrying out the method according to the first aspect; Fig. 2 diagramatically shows another embodiment of apparatus in combination with a fuel cell according to the second aspect of the invention for carrying out the method according to the first aspect; Fig. 3 diagramatically shows the combination in Fig. 2 operating to apply the reverse D.C. potential to the fuel cell; Fig. 4 diagramatically shows a modification of the combination shown in Fig. 2, and Fig. 5 diagramatically shows a stack or battery of fuel cells to which the apparatus of Fig. 1, or of Figs. 2 and 3, or of Fig. 4 can be connected so that each fuel cell in the stack or battery is operated according to the first aspect of the invention.
In the drawings the same or corresponding parts are identified by the same reference numerals.
In Fig. 1 a fuel cell 2 has a cathode 4 and an anode 6. The cathode and the anode each comprise a catalyst comprising at least platinum in some form. The fuel cell 2 comprises an electrolyte 8. A fuel gas such as hydrogen and/or a gaseous alcohol is supplied in known manner to the anode 6 along inlet conduit 10. A gaseous oxidant such as oxygen or comprising at least oxygen is supplied in known manner to the cathode 4 along inlet conduit 12.
The fuel cell 2 is operated at a temperature which does not exceed substantially 2500C.
The electrolyte 8 can be any suitable know electrolyte, and the catalyst at the cathode 4 and at anode 6 can be platinum provided in any suitable known manner or form.
The electrolyte 8 may be a solid electrolyte, for example a known solid polymer electrolyte; the fuel cell 2 being operated at a temperature which does 6 not exceed substantially 1000C, and preferably does not exceed substantially 800C.
Alternatively, the electrolyte 8 may be a liquid electrolyte. In one example, the fueld cell 2 is an alkaline fuel cell with a liquid alkaline electrolyte; the fuel cell being operated at a temperature of substantially 650C, and the catalyst may also include nickel as well as platinum provided in any suitable known manner or form. In another example, the liquid electrolyte 8 may be a known phosphoric acid electrolyte; the fuel cell 2 being operated at a temperature which does not exceed substantially 2500C, and preferably does not exceed substantially 2000C.
Electrical leads 14 and 16 are connected to the cathode 4 and anode 6 respectively. The leads 14 and 16 are connected to a first circuit comprising a switch S1 in series with a load 18 to be powered by the fuel cell. The leads 14, 16 are also connected to a second circuit comprising a switch S2 in series with an electrical cell or battery 20 having its positive terminal connected to the anode 6 (when switch S2 is closed), and its negative terminal connected to the cathode 4. Switches S1 and S2 are controlled by a control 22 comprising timing means. The control 22 so operates that when it causes switch S1 to be closed, so that the fuel cell 2 is providing electric power to the load 18, the switch S2 is simultaneously il 7 interrupted; but when the control 22 causes switch S1 to be interrupted it also causes switch S2 to be simultaneously closed so that electric power to the load 18 is interrupted and a pulse of reverse D.C. potential due to the battery 20 is applied between anode 6 and the cathode 4, thereby putting the anode at a positive potential with respect to the cathode.
The control 22 operates the switches S1 and S2 so that switch S1 is closed and switch S2 is open for substantially the same time period TI, and switch S1 is open and switch S2 is closed for substantially the same time period T2. The cycle of switch operation is thus switch S1 is closed and switch S2 is open for time T1 followed immediately by time period T2 over which switch S1 is open and switch S2 is closed. The cycle is repeated continuously. Time period T1 is at least substantially ten times greater than the time period T2, and the period T2 does not exceed substantially 0.25 seconds. Thus when time period T2 is substantially 0. 25 seconds, the period T1 can be at least substantially 2.5 seconds. It is believed to be preferable for the time period T2 (when the reverse D.C. potential is applied between the anode and the cathode) to be even shorter than substantially 0.25 seconds. For example when the time period T2 is substantially 0.1 seconds the time period T1 can be at least substantially 1.0 seconds, and when the time period T2 is substantially 0.05 seconds the time 8 period T1 can be at least substantially 0.5 seconds.
It is understood that during the application of the reverse D.C. potential between the anode 6 and cathode 4 carbon monoxide, which may be poisoning the anode catalyst, is oxidised whereby the anode catalyst is detoxified and the fuel cell 2 is rejuvenated.
The reverse D.C. potential can be substantially equal to or greater than 0.8 volts with respect to the open circuit potential of the fuel cell 2.
Referring now to Figs. 2 and 3, the second circuit connected to leads 14 and 16 differs from that in Fig. 1, in that the second circuit in Figs. 2 and 3 is a network comprising switches S3, S4, S5 and S6 and a capacitor 24. Switches S3 and S6 are in series with the capacitor 24 which is between them. Switch S4 is in parallel with switch S3 and the capacitor 24, whereas switch S5 is in parallel with the capacitor and the switch S6. Operation of the switches S1 and S3 to S6 is by the control 22. When the fuel cell 2 is to supply electrical power to the load 18, the switch S1 is closed as shown in Fig. 2, as are the switches S3 and S6 so that the cell also charges the capacitor 24; at the same time the switches S4 and S5 are open. To apply the reverse D.C. potential to the fuel cell 2 using the capacitor 24, the switches S4 and SS are closed as shown in Fig. 3 (so that the i 4 positively charged plate of the capacitor is connected 9 to the anode 6 via closed switch SS) and the switches S1, S3 and S6 are open. Thus in the cycle of operation the control 22 causes the switches S1, S3 and S6 to be closed for the aforesaid time T1 whereas simultaneously the switches S4 and SS are open, and then the switches S4 and SS are closed for the time period T2 whereas simultaneously the switches S1, S3 and S6 are open.
Because in Fig.3, the switch S1 is open the supply of electric power to the load 18 by the fuel cell 2 is interrupted. To ensure that the load 18 is continuously powered a revebible or rechcl; eable cell or battery 26 (Fig.2), for example a galvanic cell, or a capacitor 28 (Fig.3) can be in parallel with the is load. When switch S1 is open the cell 26 supplies k electric power to the load 18, or disctarge of the capacitor does the same. When the switch S1 is closed. the cell 26, for example a lead-acid cell, or the capacitor 28 is recharged by the fuel cell 2. The capacitor 24 is replaced in Fig.4 by a rech r apeable cell or battery 30 to provide the reverse D.C. potential as required.
Any or all of the switches S1 to S6 may be mechanical switches, for example relays, or may be electronic solid state switching arrangements, for example thyristors.
In Fig.5, a plurality of said fuel cells 2 (individually assigned the reference 2A,2B or 2C) are represented as being electrically connected together in series in a stack or battery 32 to which the electrical lead 14 is connected to the cathode 4 of the fuel cell 2A and the electric led 16 is connected to the anode 6 of the fuel cell 2C. When there are n fuel cells in series forming a stack or battery (where n is any whole number) the reverse D.C. potential applied to the stack or battery may be substantially equal to or greater than n x 0.8 volts with respect to 10 the open circuit poential of the stack or battery.
1 z 11

Claims (25)

Claims
1. A method of operating a fuel cell of the type comprising an anode and a cathode each comprising catalyst means comprising platinum, the method comprising supplying gaseous fuel comprising hydrogen and/or a gaseous alcohol to said anode and supplying gaseous oxidant comprising oxygen to said cathode, operating the fuel cell at a temperature which does not exceed substantially 2500C, providing an interruptable first circuit externally of the cell for electric current derived from the cell to flow in the external circuit from the cathode to the anode by reason of the cathode being at a positive potential relative to the anode, providing a second circuit externally of the cell, said second circuit comprising electrical energy supply means to supply selectively a reverse D.C. potential to said anode and cathode thereby putting the anode at a positive potential with respect to said cathode, interrupting and completing the first circuit alternately and operating the second circuit whereby when the first circuit is interrupted the reverse D.C. potential is applied simultaneously by means of the second circuit and when the first circuit is completed application of said reverse D.C. potential ceases, said first circuit being completed for a first time period and said reverse D.C. potential being applied for a second time 12 period, said first time period being at least substantially ten times greater than said second time period, and the second time period being not greater than substantially 0.25 seconds.
2. A method as claimed in Claim 1, in which the catalyst means is platinum.
3. A method as claimed in Claim 1 or Claim 2, in which the operating temperature of the fuel cell does not exceed substantially 1000.
4. A method as claimed in Claim 1 or Claim 2, in which the operating temperature of the fuel cell does not exceed substantially 800.
5. A method as claimed in Claim 3 or Claim 4, in which the fuel cell comprises a solid polymer electrolyte.
6. A method as claimed in Claim 1 or Claim 2, in which the operating temperature does not exceed substantially 2000.
7. A method as claimed in Claim 1, 2 or 6, in which the fuel cell comprises a liquid electrolyte.
8. A method as claimed in Claim 7, in which of the fuel cell comprises a phosphoric acid electrolyte.
9. A method as claimed in Claim 1, in which the fuel cell comprises a liquid alkaline electrolyte.
10. A method as claimed in any one preceding claim, in which the electrical energy supply means comprises electrical cell or battery means.
11. A method as claimed in any one of Claims 1 to 1 7 13 9, in which the electrical energy supply means comprises rechargeable electrical cell or battery means.
12. A method as claimed in any one of Claims 1 to 9, in which the electrical energy supply means comprises capacitor means.
13. A method as claimed in any one preceding Claim, in which the first circuit comprises an electrical load to be powered by the fuel cell, and second electrical energy supply means is provided to power the load when the first circuit is interrupted.
14. A method as claimed in Claim 13, in which said second electrical energy supply means comprises electrical cell or battery means.
15. A method as claimed in Claim 13, in which said second electrical energy supply means comprises rechargeable electrical cell or battery means.
16. A method as claimed in Claim 13, in which the second electrical energy supply means comprises capacitor means.
17. A method as claimed in any one preceding Claim, in which the first circuit means is interrupted and completed and the second circuit means is operated by operation of control means operating switch means in the first and second circuit means.
18. A method as claimed in Claim 17, in which said switch means is provided by solid state switching means.
14
19. A method as claimed in any one preceding Claim, in which the first time period is substantially 2.50 seconds and the second time period is substantially 0.25 seconds, or the first time period is substantially 1.0 seconds and the second time period is substantially 0.1 seconds, or the first time period is substantially 0.5 seconds and the second time period is substantially 0.05seconds.
20. A method as claimed in any one preceding Claim, in which said method is applied to the operation of a stack or battery comprising a plurality of said fuel cells.
21. A method as claimed in any one of Claims 1 to 20, in which the reverse D.C. potential is greater is than or at least substantially equal to 0.8 volts, with respect to the open circuit potential of the fuel cell.
22. A method as claimed in Claim 20, in which the reverse D.C. potential applied to the stack or battery of said fuel cells in series is greater than or at least substantially equal to n x 0.8 volts with respect to the open circuit potential of the stack or battery, and n is equal to the number of fuel cells in the stack or battery.
23. Apparatus to be used in combination with a fuel cell or with a stack or battery thereof so that when the apparatus is in use in said combination the or each fuel cell is operated according to the method g' 51 claimed in any one preceding claim provided the or each said fuel cell is operated at said temperature conditions and is supplied with said gaseous fuel.
24. A method of operating a fuel cell of the type comprising an anode and a cathode each comprising catalyst means comprising platinum, said method being substantially as hereinbefore described with reference to Fig. 1 or to Figs. 2 or 3, or to Fig.4, or to Figs. 1 to 5, or Figs. 2, 3 and 5, or to Figs. 4 and 5.
25. Apparatus in combination with a fuel cell or with a stack or battery thereof, said apparatus being constructed and arranged to operate substantially as hereinbefore described with reference to Fig.1 or to Figs. 2 and 3, or Fig. 4 or Figs. 1 and 5, or to Figs.
2, 3 and 5, or to Figs. 4 and 5.
GB9511533A 1994-06-16 1995-06-07 A method of operating a fuel cell Expired - Fee Related GB2290409B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9412073A GB9412073D0 (en) 1994-06-16 1994-06-16 Method of operating a fuel cell

Publications (3)

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GB9511533D0 GB9511533D0 (en) 1995-08-02
GB2290409A true GB2290409A (en) 1995-12-20
GB2290409B GB2290409B (en) 1997-04-02

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GB9412073A Pending GB9412073D0 (en) 1994-06-16 1994-06-16 Method of operating a fuel cell
GB9511533A Expired - Fee Related GB2290409B (en) 1994-06-16 1995-06-07 A method of operating a fuel cell

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GB9412073A Pending GB9412073D0 (en) 1994-06-16 1994-06-16 Method of operating a fuel cell

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US (1) US5601936A (en)
EP (1) EP0701294A1 (en)
JP (1) JP3357218B2 (en)
CA (1) CA2150082C (en)
GB (2) GB9412073D0 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999034465A1 (en) * 1997-12-23 1999-07-08 Ballard Power Systems Inc. Method and apparatus for operating an electrochemical fuel cell with periodic fuel starvation at the anode
EP1112600A1 (en) * 1998-07-01 2001-07-04 Avista Laboratories, Inc. Improved fuel cell and method for controlling same
US6329089B1 (en) 1997-12-23 2001-12-11 Ballard Power Systems Inc. Method and apparatus for increasing the temperature of a fuel cell
US6472090B1 (en) 1999-06-25 2002-10-29 Ballard Power Systems Inc. Method and apparatus for operating an electrochemical fuel cell with periodic reactant starvation

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1004513C2 (en) * 1996-11-13 1998-05-29 Stichting Energie Series connected fuel cell system.
US5753383A (en) * 1996-12-02 1998-05-19 Cargnelli; Joseph Hybrid self-contained heating and electrical power supply process incorporating a hydrogen fuel cell, a thermoelectric generator and a catalytic burner
US20030022033A1 (en) * 1997-03-15 2003-01-30 Mannesmann Ag Fuel cell with pulsed anode potential
DE19710819C1 (en) * 1997-03-15 1998-04-02 Forschungszentrum Juelich Gmbh Fuel cell with anode-electrolyte-cathode unit
US6063516A (en) 1997-10-24 2000-05-16 General Motors Corporation Method of monitoring CO concentrations in hydrogen feed to a PEM fuel cell
US5935726A (en) 1997-12-01 1999-08-10 Ballard Power Systems Inc. Method and apparatus for distributing water to an ion-exchange membrane in a fuel cell
ITMI980914A1 (en) * 1998-04-29 1999-10-29 De Nora Spa METHOD FOR THE INTEGRATION OF FUEL CELLS WITH ELECTROCHEMICAL SYSTEMS
JP2002539586A (en) * 1999-03-09 2002-11-19 シーメンス アクチエンゲゼルシヤフト Fuel cell and low-temperature starting method thereof
WO2001080340A1 (en) * 2000-04-14 2001-10-25 Vodafone Ag Circuit for generating voltage pulses and impressing voltage pulses upon a fuel cell and fuel cell system
CA2420887A1 (en) * 2000-09-01 2002-03-07 Global Thermoelectric Inc. Anode oxidation protection in a high-temperature fuel cell
DE10053851A1 (en) * 2000-10-30 2002-05-08 Siemens Ag Process for the regeneration of CO poisoning in HT-PEM fuel cells
US20030070850A1 (en) * 2001-02-16 2003-04-17 Cellex Power Products, Inc. Hybrid power supply apparatus for battery replacement applications
US6649290B2 (en) 2001-05-11 2003-11-18 Cellex Power Products, Inc. Fuel cell thermal management system and method
US6559621B2 (en) 2001-05-21 2003-05-06 Cellex Power Products, Inc. Hybrid energy storage device charge equalization system and method
US6630259B2 (en) 2001-05-23 2003-10-07 Avista Laboratories, Inc. Fuel cell power system performing AC inversion, method of distributing AC power, and method of operating a fuel cell power system
US6497974B2 (en) 2001-05-23 2002-12-24 Avista Laboratories, Inc. Fuel cell power system, method of distributing power, and method of operating a fuel cell power system
US6534950B2 (en) 2001-05-25 2003-03-18 Cellex Power Products, Inc. Hybrid power supply control system and method
WO2003028131A2 (en) * 2001-08-29 2003-04-03 Forschungszentrum Jülich GmbH Fuel cell, fuel cell stack and an operating method for the same
US6703155B2 (en) 2001-11-13 2004-03-09 Avista Laboratories, Inc. Power tap device, fuel cell stack, and method of dividing a fuel cell stack
US7144646B2 (en) * 2001-12-14 2006-12-05 Ballard Power Systems Inc. Method and apparatus for multiple mode control of voltage from a fuel cell system
US6875539B2 (en) * 2002-01-18 2005-04-05 Heiner Ophardt Combination liquid dispenser and electrochemical cell
US6620538B2 (en) * 2002-01-23 2003-09-16 Avista Laboratories, Inc. Method and apparatus for monitoring equivalent series resistance and for shunting a fuel cell
AU2003210939A1 (en) * 2002-02-06 2003-09-02 Battelle Memorial Institute Polymer electrolyte membrane fuel cell system
AU2003219726A1 (en) 2002-02-06 2003-09-02 Battelle Memorial Institute Methods of removing contaminants from a fuel cell electrode
EP1476524B1 (en) * 2002-02-19 2008-11-19 International Inc. Honeywell Heat transfer compositions with high electrical resistance for fuel cell assemblies
US6730424B1 (en) * 2002-03-14 2004-05-04 H Power Corporation Electrochemical method to improve the performance of H2/air PEM fuel cells and direct methanol fuel cells
CA2480670C (en) * 2002-03-29 2011-05-03 Estco Battery Management Inc. Fuel cell health management system
US7087327B2 (en) * 2002-05-16 2006-08-08 Ballard Power Systems Inc. Electric power plant with adjustable array of fuel cell systems
WO2004054022A2 (en) * 2002-12-05 2004-06-24 Battelle Memorial Institute Methods of removing sulfur from a fuel cell electrode
DE10261418A1 (en) * 2002-12-30 2004-07-15 Daimlerchrysler Ag Operation of vehicle fuel cell has MOS FET switches in series with cell and battery that are independently operated
US7932634B2 (en) * 2003-03-05 2011-04-26 The Gillette Company Fuel cell hybrid power supply
US20070237993A1 (en) * 2003-03-21 2007-10-11 Karin Carlsson Fuel cell reforming
US20040185328A1 (en) * 2003-03-21 2004-09-23 Lifun Lin Chemoelectric generating
US7632583B2 (en) * 2003-05-06 2009-12-15 Ballard Power Systems Inc. Apparatus for improving the performance of a fuel cell electric power system
US7419734B2 (en) * 2003-05-16 2008-09-02 Ballard Power Systems, Inc. Method and apparatus for fuel cell systems
US7078118B2 (en) * 2003-11-05 2006-07-18 Utc Fuel Cells, Llc Performance enhancing break-in method for a PEM fuel cell
US20050112436A1 (en) * 2003-11-25 2005-05-26 Carol Jeffcoate Methods and devices for heating or cooling fuel cell systems
US20050249989A1 (en) * 2004-05-07 2005-11-10 Pearson Martin T Apparatus and method for hybrid power module systems
US7521138B2 (en) * 2004-05-07 2009-04-21 Ballard Power Systems Inc. Apparatus and method for hybrid power module systems
JP4951847B2 (en) * 2004-07-23 2012-06-13 パナソニック株式会社 Fuel cell activation method
KR101126206B1 (en) * 2005-02-02 2012-03-23 삼성에스디아이 주식회사 Fuel cell system
US20070275275A1 (en) * 2006-05-23 2007-11-29 Mesa Scharf Fuel cell anode purge systems and methods
RU2330353C1 (en) * 2007-02-13 2008-07-27 Анатолий Иванович Мамаев Ai mamaev's method of converting chemical energy to electrical energy and device for implementing method
JP2008311064A (en) * 2007-06-14 2008-12-25 Canon Inc Fuel cell system and activation method of fuel cell
JP5312076B2 (en) * 2009-02-06 2013-10-09 トヨタ自動車株式会社 Fuel cell system
CN103840184B (en) * 2012-11-23 2015-12-23 中国科学院大连化学物理研究所 A kind of direct borohydride fuel cell monocell activation method
KR101558750B1 (en) * 2014-03-24 2015-10-08 현대자동차주식회사 System and method for recovering output of fuel cell
WO2022201484A1 (en) * 2021-03-26 2022-09-29 本田技研工業株式会社 Method for aging fuel cell

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501803A (en) * 1982-09-02 1985-02-26 Eltech Systems Corporation Porous gas diffusion-electrode
JPS61165966A (en) * 1985-01-17 1986-07-26 Sanyo Electric Co Ltd Regeneration of fuel electrode of fuel cell
EP0357077A2 (en) * 1988-09-01 1990-03-07 Eltech Systems Corporation Platinum black air cathode, method of operating same, and layered gas diffusion electrode of improved inter-layer bonding
JPH076778A (en) * 1992-01-14 1995-01-10 Mitsui Eng & Shipbuild Co Ltd Method for improving characteristic of high temperature solid electrolyte fuel cell

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207682A (en) * 1960-07-25 1965-09-21 Leesona Corp Activation of electrodes of fuel cells
US3300345A (en) * 1964-09-03 1967-01-24 Jr Ernest H Lyons Electrolytic cell for producing electricity and method of operating the cell
US3436271A (en) * 1965-07-07 1969-04-01 Texas Instruments Inc Method of improving the performance of fuel cells
FR93188E (en) * 1966-10-19 1969-02-21 Centre Nat Rech Scient Improvements made to electrochemical generators, in particular to their electrodes in contact with which the oxidation of a fuel takes place.
US3544380A (en) * 1967-04-21 1970-12-01 Hooker Chemical Corp Method of activating fuel cell electrode by direct current
JPS6062063A (en) * 1983-09-13 1985-04-10 Hitachi Ltd Activation method of electrode for fuel cell
JPS61243663A (en) * 1985-04-19 1986-10-29 Hitachi Ltd Regenerating method for phosphoric acid-electrolyte type fuel cell
JPS6222572A (en) * 1985-07-24 1987-01-30 Naoko Osaki Production of fish meat paste product similar to crab leg
JPS62216172A (en) * 1986-03-17 1987-09-22 Toshiba Corp Manufacture of fuel cell
JPH01211860A (en) * 1988-02-18 1989-08-25 Fuji Electric Co Ltd Control device for fuel cell power generating system
US5100742A (en) * 1990-03-08 1992-03-31 Gte Laboratories Incorporated Method and device for gaseous fuel cell operation
US5132193A (en) * 1990-08-08 1992-07-21 Physical Sciences, Inc. Generation of electricity with fuel cell using alcohol fuel
EP0559816B1 (en) * 1990-11-23 1997-05-28 Vickers Shipbuilding & Engineering Limited Application of fuel cells to power generation systems
JP3360318B2 (en) * 1992-08-20 2002-12-24 富士電機株式会社 Fuel cell generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501803A (en) * 1982-09-02 1985-02-26 Eltech Systems Corporation Porous gas diffusion-electrode
JPS61165966A (en) * 1985-01-17 1986-07-26 Sanyo Electric Co Ltd Regeneration of fuel electrode of fuel cell
EP0357077A2 (en) * 1988-09-01 1990-03-07 Eltech Systems Corporation Platinum black air cathode, method of operating same, and layered gas diffusion electrode of improved inter-layer bonding
JPH076778A (en) * 1992-01-14 1995-01-10 Mitsui Eng & Shipbuild Co Ltd Method for improving characteristic of high temperature solid electrolyte fuel cell

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JAPIO Abstract Section E,Section No. 463, Vol.10, No.370, (P-67) & JP 61 165 966 A *
WPI Accession No.95-079124/11 & JP 07 006 778 A *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999034465A1 (en) * 1997-12-23 1999-07-08 Ballard Power Systems Inc. Method and apparatus for operating an electrochemical fuel cell with periodic fuel starvation at the anode
US6096448A (en) * 1997-12-23 2000-08-01 Ballard Power Systems Inc. Method and apparatus for operating an electrochemical fuel cell with periodic fuel starvation at the anode
US6329089B1 (en) 1997-12-23 2001-12-11 Ballard Power Systems Inc. Method and apparatus for increasing the temperature of a fuel cell
US6764780B2 (en) 1997-12-23 2004-07-20 Ballard Power Systems Inc. Method and apparatus for increasing the temperature of a fuel cell
EP1112600A1 (en) * 1998-07-01 2001-07-04 Avista Laboratories, Inc. Improved fuel cell and method for controlling same
EP1112600A4 (en) * 1998-07-01 2007-05-09 Relion Inc Improved fuel cell and method for controlling same
US6472090B1 (en) 1999-06-25 2002-10-29 Ballard Power Systems Inc. Method and apparatus for operating an electrochemical fuel cell with periodic reactant starvation

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US5601936A (en) 1997-02-11

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